All water systems in California
7,380 systems
| System | Serves | Status | Rules violated, 3 yr | Unresolved |
|---|---|---|---|---|
|
Tulare County Civic Center Tulare County |
300 | 1 | 1 | |
|
U.s. Army Corps-Lake Mendo (pomo Site) Mendocino County |
300 | 0 | 0 | |
|
US Army Corps/island Park Fresno County |
300 | 1 | 0 | |
|
Usfs Sourgrass Campgd Tuolumne County |
300 | 0 | 0 | |
|
Usfs/jackass Meadow Campground Fresno County |
300 | 0 | 0 | |
|
Usmc/mtn Warfare Trng Ctr Bridgeport Mono County |
300 | 1 | 0 | |
|
Wilton Chevron Sacramento County |
300 | 2 | 0 | |
|
Woodward Bluffs MHP Fresno County |
300 | 0 | 0 | |
|
Wp&a King Water System Kern County |
300 | 0 | 0 | |
|
Yosemite Nps-May Lake Camp Mariposa County |
300 | 0 | 0 | |
|
Yosemite Nps-White Wolf Tuolumne County |
300 | 0 | 0 | |
|
Yurok Terwer Water System County |
300 | 6 | 1 | |
|
Hope Foundation/moriah Heights Amador County |
299 | 1 | 0 | |
|
Nps Manzanar Inyo County |
298 | 0 | 0 | |
|
San Pasqual Academy San Diego County |
298 | 0 | 0 | |
|
Del Oro WC Country Estates Dist Kern County |
297 | 1 | 1 | |
|
Hidden View Hensley Lake Madera County |
297 | 0 | 0 | |
|
Lake Madrone Water District Butte County |
297 | 1 | 0 | |
|
Don Pedro Rec Ag:blue Oaks Tuolumne County |
296 | 1 | 0 | |
|
Korbel Brothers Winery Sonoma County |
296 | 0 | 0 | |
|
La Jolla Western County |
296 | 1 | 0 | |
|
Rancho Calimesa Mobile Home Park Riverside County |
296 | 0 | 0 | |
|
Eleanor Roosevelt Comm Learning Ctr Tulare County |
295 | 0 | 0 | |
|
Lactalis Heritage Dairy Tulare County |
295 | 3 | 1 | |
|
Manzanita Elementary School Butte County |
295 | 1 | 1 | |
|
Skyline Park Santa Barbara County |
295 | 0 | 0 | |
|
Stanford Sierra Camp El Dorado County |
295 | 0 | 0 | |
|
Mariposa Pines Mutual Mariposa County |
294 | 2 | 1 | |
|
North Peak Mutual Water Company San Diego County |
294 | 0 | 0 | |
|
Lewis Cellars Napa County |
293 | 0 | 0 | |
|
Fcwwd 42/alluvial & Fancher Fresno County |
291 | 1 | 0 | |
|
Rancheritos #2 San Bernardino County |
291 | 1 | 1 | |
|
Auburn Valley Community Service Dis Placer County |
290 | 1 | 0 | |
|
Downieville Public U.d. Sierra County |
290 | 2 | 1 | |
|
Eastern Sierra College Center Bishop Inyo County |
290 | 0 | 0 | |
|
Gill Creek Mutual Water Company Sonoma County |
290 | 0 | 0 | |
|
Gran Mutual Water CO Butte County |
290 | 1 | 0 | |
|
Morada Estates PWS San Joaquin County |
290 | 0 | 0 | |
|
Rancho del Campo Water System San Diego County |
290 | 0 | 0 | |
|
Schelby School Merced County |
290 | 0 | 0 | |
|
Sid Elmira Solano County |
290 | 0 | 0 | |
|
Gravenstein School District-Hillcrest Sonoma County |
289 | 1 | 1 | |
|
Grenada Sanitary District Siskiyou County |
289 | 1 | 1 | |
|
Round Valley Elementary School Mendocino County |
289 | 1 | 1 | |
|
Cdpr-McConnell Merced County |
288 | 0 | 0 | |
|
Oakhurst Christian Conf Center Madera County |
288 | 0 | 0 | |
|
Belmont Terrace Mutual Water Company Sonoma County |
287 | 0 | 0 | |
|
Oid #51 Sunset Oaks #10 Stanislaus County |
287 | 0 | 0 | |
|
Hagaman County Park Merced County |
285 | 0 | 0 | |
|
Camp Navarro Mendocino County |
284 | 0 | 0 |
About this data
Rules violated counts the rules a system was in violation of in the past three years, including monitoring and reporting lapses; one rule can carry several violations. Unresolved is the number of those rules currently in violation at EPA's latest data refresh.
Source: the U.S. EPA's Enforcement and Compliance History Online system (ECHO), which publishes the federal Safe Drinking Water Information System. EPA's terms and values are shown as published. The California records are from EPA's data refresh of Oct 7, 2026; EPA refreshes this data quarterly, and states report to EPA with a lag of three to six months, so the newest violations may not appear yet.